Colored rubber products and a process of producing them



Patented Feb UNI? Search R00 JFFICE COLORED RUBBER PRODUCTS AND A PROCESS OF PRODUCING THEM Ernst Fischer,

Offenbach-on-the-Main,

Ger-

many, assignor to General Aniline Works, Inc., New York, N. Y., a corporation of Delaware No Drawing. Application December 28, 1936, Serial No. 117,975. In Germany January 3, 1936 7 Claims.

AlkyLO H N I wherein R1 stands for a member of the group consisting of hydrogen, alkyl, benzyl, a radical of the benzene and naphthalene series and a hydro-aromatic radical, Y for a member of the group consisting of hydrogen, halogen and alkoxy, X1 for a member of the group consisting of hydrogen, alkyl, alkoxy and the group NH.CO.R2, X2 for a member of the group consisting of alkoxy and the group -NH.CO.R2, always one of the two substituents X1 and X2 being the group NH.CO.R2, and wherein R2 stands for a member of the group consisting of alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical. With these dyestuffs there are obtained clear violet and blue shades having very good fastness properties. They are adapted for the different kinds of hot and cold vulcanization processes. They are insoluble in benzinc, do not bleed into rubber when the rubber products are worked up and do not give rise to that phenomenon which is known as blushing or emorescence when the rubber articles are stored.

Now, I have found that valuable rubber dyeing of similar good properties may be obtained by using in the above mentioned process such dyestuiIs as contain the CO.NH.R1 group in the arylide radical of the coupling component in meta-position and have in orthoor para-position to the CO.NH.R1 group further substitucuts, 1. e. mono-azo-dyestuifs of the following general formula:

I if N C O.NH.R

O H Y CO-NH 15 wherein R1 stands for a member of the group consisting of hydrogen, alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, Y for a. member of the group consisting of hydrogen, halogen and alkoxy, X1 for a member of the group consisting of hydrogen, alkyl, alkoxy and the group NH.CO.R:, X2 for a member of the group consisting of alkoxy and'the group-NH.CO.R:, always one of the two substituents X1 and X: being the group NH.CO.R2, R2 stands for a member of the group consisting of alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, and wherein the benzene 30 nucleus a is substituted in at least one of the two positions Y1 and Y2 by a member of the group consisting of alkyl, alkoxy, phenoxy and halogen.

Since the dyestuffs do not bleed into white rubber they are distinctly superior, especially 35 with regard to this behavior, to the dyestuffs disclosed in German Patent No. 601,254. In German Patent No. 604,299 there is described a process for producing blue and violet rubber dyeings of good fastness properties by using disazodyestuffs which, however, cannot always be obtained on a technical scale in the necessary uniform quality. Therefore, the replacement of the disazo-dyestufi's by mono-azo-dyestuifs, which yield rubber dyeings of the same good fastness properties, constitutes a valuable advance in the art.

The following examples serve to illustrate the invention, but they are not intended to limit it thereto; the parts are by weight: 50

(1) A rubber mixture is prepared from 100 parts of crepe rubber, 1 part of stearic acid, 2.6 parts of sulfur, 5 parts of zinc white, 1 part oi. mercapto-benzothiazol, 0.2 part of hexamethylenetetramine, 60 parts of calcium carbonate, 0.6 part of ozocerite, 10 parts of lithopone, 5 parts of titanium dioxide and 2 parts of the dyestufl obtainable by coupling diazotized 1-amino-2.5- diethoxy-4-benzoylaminobenzene with 2.3-hydroxynaphthoyl-l'- amino-2- methylbenzene-5'- (carbonylaminobenzene). The mixture is vulcanized in a vulcanization press for 12 minutes at a steam pressure of 3 atmospheres above atmospheric pressure. There is obtained a reddish-blue vulcanizate of very good properties of fastness.

(2) A rubber mixture is prepared in the usual manner from crepe rubber, the usual admixtures and 2 parts of the dyestufl' obtainable by coupling diazotized 1-amino-2.5-diethoxy-4-benzoylaminobenzene with 2.3-hydroxynaphthoyl-1'-amino- 4- methoxybenzene-5'-(carbonyl-1"- amino-2"- ethoxy-5"-methylbenzene). The mixture is vulcanized in the cold by immersing it for 8 seconds in a solution of 3 parts of sulfur chloride in 9'7 parts of benzene. There is obtained a violet vulcanizate which is, as to its fastness properties, very similar to that described in Example 1.

The following table illustrates a series of dyestuffs which may be substituted for those of Examples 1 and 2 and which dye the vulcanizates very fast tints.

wherein R1 stands for a member of the group consisting of hydrogen, alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, Y for a member of the group consisting of hydrogen, halogen and alkoxy, X1 for a member of the group consisting of hydrogen, alkyl, alkoxy and the group --NH.CO.R2, X: for a member of the group consisting of alkoxy and the group NI-I.CO.R:, always one of the two substituents X1 and X2 being the group --NH.CO.R:, R2 stands for a member of the group consisting, of alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, and wherein the benzene nucleus a is substituted in at least one of the two positions Y; and Y: by a member of the group consisting of alkyl, alkoxy, phenoxy and halogen, and then vulcanizing the mixture.

2. The process of producing colored rubber 20 products which comprises mixing a rubber prod- Dyestun's from 25 Diazo compound ol Coupled with- Shade 2, 3-hydroxynaphthoyl-l'-amino- 1 l-Bmlno-Z,6-dieth0xy-4-benzoylaminobenzene -2:-methylbenzene-5'-gcarbonylaminobenzene) Blue. 2 l-am no-2, 5-d methoxy-i-benzoylaminobenzene- -2 -methoxybenzene-5 (carbouylarmnobenzene) Do. 30 3 l-amino-Z,5-diethoxyi-benzoylaminobenzene -2-chlorobenzene-5-(carbonylaminobenzene) Violet 4 .....do n -2-phenoxybenzene-5'-(carbonylaminobenzene) Blue. 5 l-amrno-Z,5-d methoxy-4-benzoylanunobenzene -2-methyIbenzene-5-(carboxyl c ac d-cyclohexylamide). Violet 6 l-am no-2, 5-d1 ethoxy-i-benzoylaminobenzene. -2-methylbenzane-5-(carboxyl1cacid-benzyl-amide) Blue. 7 l-ammo,2, 5-d1methoxy-4-benzoylaminobenzen -2-methy1benzene 5 Violet. 8 do -2-methylbenzene- Do. 9 do -2methylbenzene D0. 10 .d o -21,4-diethoxybenzene-s (carbonylaminobenzene). 30 g l-aniiigo-z5-diethoxy-i-benzoylammobenzene -ghlorolenzene-g;&carbb%nyHammol)enzene% romo enzenecar 11 amino enzene l3 Lamina-2,4-dimethoxy-5-benzoylaminobenzene. -2-methylbenzene-5'-(carbo ylaminobenzone 14 1'amino-2, 4-dimethoxy-5-benzoylaminobenzene do 15 l-amino-2-methoxy-5-methyl-4-benzoylaminobenzene. ..d0 l6 l-amino-Z-methoxyA-acetaminobenzene d0 l7 1-aminc-2,5-dimethoxy-4-acetaminobenzene -2'-chlorobenzone-5'-(carbouylaminobenzene) 18 1-amino-2,5'diethoxy-4-phenacetylaminobeuzene -2'-methylbenzene-5'-(earbonylaminobenzene) 40 19 1-amino-2,5-diethoxy-4-hexahydrobenzoyl-aminobenzene -d D0. 20 l-amino-2, 5-dimethoxy-4'-(alpha-) naphthoylaminobendo Blue.

zone 21 l-amino-2,5-diethoxy-4-(4'-chloro)benzoylaminobenzene. 2-chlorobenzene-5'-(carbonylaminobenzene) Violet. 22 1-amino-2, 5-d1ethoxy-4-benzoylsminobenzene -2'-methoxybenzene-6'-(carbonylaminobenzene) Do. 23 -2'-methylbenzene-5-(carboxylicacid-cyclohexylamide) Do. 24 -2methylbenzene-5'-(carbonyl-l"-am1no-4"-chlorobenzene) D0. 25 -2',4-diethoxybenzene-5'-(carbonylaminobenzeue).- D0. 26 -2'-methoxybenzene-5'-(carbonyl-2-amino-naphthalene) Do. 27 -2'-methylbenzene-5'-(carbonyl-2-amino-]",2",3", -tetra- Do.

hydronaphthalene) 28 -2- Hi11(ithygbeHZeD;5-5'- (carbonyl-1- amino-2"- methyl-B"- Blue c are enzene 29 1-amino-2,5-diethoxy-4-(4 chloro)benzoylaminobcnzene. M) -2'-mgtlyllbgnzene-5- cltafiborliy laminobenzene)" 0 romoy roxy-na oy- -ammo- 0 2(1) lamina-g,g-giethto y-kieioylaininonbetnezeuo -2'-methylbenzene-s' marbonylaminobenzene) D -ammoime oxynzoyam 0 meme o 0.

' 6-rneth0xy-2, 3-hyclroxy-naphthoyl-l-aminog; lamina-g,igiethg xyilgegzoyla ninobeg zene -2'-n i ethylbenzcne-5'-(carbonylsminobenzenc) D0.

amino-s me oxyenzoy amino nzene o 34 1-amin0-2:5-dimethoxyi-benzoylaminobenzene -2'-methoxybenzenc-5'-(carbonylaminobeuzene) B e.

I claim:' 1 uct with a water-insoluble mono-azo-dyestuif 1. The process of producing colored rubber corresponding to the following general formula: products which comprises mixing a rubber prod- NH O C H uct with a water-soluble mono-azo-dyestufi 5 60 corresponding the the following general formula: y X1 AlkyLO AlkyLO GO.NH.B|

If OH Y1 GO.NH.R\ 7 OH Y1 G0.NH I

GO.NH

wherein R1 stands for a member of the group 260. CHEMISTRY, CARBON COMPOUNDS.

of'the benzene and naphthalene series and a. hydroaromatic radical and wherein the benzene nucleus a is substituted in at least one of the two positions Y1 and Y2 by a member of the group consisting of alkyl, alkoxy, phenoxy and halogen,

and then vulcanizing the mixture.

3. Colored vulcanized rubber products containing a water-insoluble mono-azo-dyestuff of the following general formula:

wherein R1 stands for a member of the group consisting of hydrogen, alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, Y for a member of the group consisting of hydrogen, halogen and alkoxy, X1 for a member of the group consisting of hydrogen, alkyl, alkoxy and the group NH.CO.R2, X: for a member of the group consisting of alkoxy and the group NH.CO.R2, always one of the two substituents X1 and X2 being the group NH.CO.R2, R2 stands for a member of the group consisting of alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, and wherein the benzene nucleus a is substituted in at least one of the two positions Y1 and Y2 by a member of the group consisting of alkyl, alkoxy, phenoxy and halogen.

4. Colored vulcanized rubber products containing a water-insoluble mono-azo-dyestufi of the following formula:

0.8.lkyl

Alkyl, 0

wherein R1. stands for a member of the group consisting of hydrogen, alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical and wherein the benzene nu cleus a is substituted in at least one of the two positions Y1 and Y2 by a member of the group consisting of alkyl, alkoxy, phenoxy and halogen.

5. Colored vulcanized rubber products containing a water-insoluble mono-azo-dyestufl oi the following formula:

NH.CO.CH5

OCHz i N comment.

o0.NH

6. Colored vulcanized rubber products containing a water-insoluble mono-azo-dyestufi of the following formula:

l rtoomm goon!- N correctnc O.NH/

7. Colored vulcanized rubber products containing a water-insoluble mono-azo-dyestufl of the following formula:

onio

f r by C O.NH.CaHl

on 00in.

\CO.NH/

ERNST FISCHER.

DB'di UH noun.

l L, 0 7 (a 7 CERTIFICATE OF CORRECTION. a a

Patent No. 2,1h9 212. mm 28-, 19 9.

ERNST FISCHER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, first column, in the table, under the heading "Diazo compound of-", item lLL, for

' "h-dimethory" read h-diethoxy; same page and column, line. 60, claim 1, for the word "water-soluble" read water-insoluble; line 61, same claim, for "the the" read to the; and that the said Letters Patent should be read with this correction therein that the same may conforn to the record of the case in the Patent Office.

Signed and sealed this hth day of July, A. D. 1959.

Henry Van Arsdale (Seal) Acting Commissioner of Patents. 

